VTech IS7121 Installation Manual page 14

Option 2: Ring the rear doorbell of the IS7121 and existing wired
doorbell simultaneously.
If you do not connect domestic power supply nor install
AA batteries to the IS7121 doorbell, only the existing wired
doorbell will ring when being pressed.
5. Follow Step 6 to Step  in Doorbell wall mount installation on
pages 0 to  to complete the installation.
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Rear
Trans
Chime/buzzer of
wired doorbell
4
Transformer
Transformer
Front
6-0032-00-00